A question about 2 killer perks, can u help me?

I have a doubt that does not let me sleep, could you tell me if when combining dying light and thanatophobia they are cumulative? In other words, thanatophobia, I can have 2 survivors injured and they accumulate 8 percent more dying light if 3 survivors would have hung, which gives 9 percent, that is, in this scenario it would have 17 percent of its combined effect, or does it not work like that?

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